It's not really even intended to be a food item - it's edible (allegedly), but that's not what it's for.

It's to attract ATTENTION.

Well, let's help it out a bit, shall we?

The dish or glass in which the sundae is served
can have a small clip-on device attached, which contains a simple red laser pointer. Powered by three watch batteries, it can run for hours - far longer than the lifetime of the sundae. Just turn it on and aim at the cherry. (If the skin is too reflective, you might need to peel a small spot to get more light inside the cherry.)

There - that strugglingly red cherry on top turns into a veritable beacon.

Like it - this could be productised along with cherry recognition software and sold to bakeries and the like in order to liven up their cupcake displays. Who could resist the allure of a cherry that's been professionally brightened by light amplified by the stimulated emission of radiation?